action replay can be bought from most, gaming shops, and HMV and argos or online at amazon or eBay you enter codes or download cheat to the action replay cart via a PC then you start up the ds with...
they are both worth it but datel is better because it automatically puts in the games id instead of you having to remember it but the Pokemon one loads faster but is not worth the load because it...
all of these codes work (except the ribbons one), i tried them myself. Level 100 Shinies. Press L+R, then discard the amt of masterballs in your first inventory spot to equal the National Dex number...